"The brothers return for a brand new adventure on the high seas! Set sail with Mario and Luigi on Shipshape Island (part ship, part island) and journey through the vast world of Concordia. Launch out of Shipshape’s cannon to visit, explore, and quest your way through islands that range from tropical rainforests to bustling cities. Meet new friends along the way, like Connie and Snoutlet (who's definitely not a pig), and encounter familiar faces from the Mushroom Kingdom like Peach and Bowser, who may help you on your journey! You’ll have to rely on Mario and Luigi’s brotherly bond to succeed. Use Bros. Moves to get past obstacles while you explore, and powerful Bros. Attacks in a dynamic twist on turn-based combat. You’ll need every edge this 'brothership' will give you to save the day!"

There hadn't been a new Mario & Luigi RPG in almost 10 years (not counting remakes) so I was not expecting this. I loved the first two games in the series but lost interest in handheld's shortly after so I'm looking forward to checking this one out.

When I went to watch the Direct shortly after it was up on Youtube I got to the end of this announcement and it said 7/11/24 and I got all excited thinking it was coming out in 3 weeks which seemed crazy and then I noticed I was watching the Nintendo UK video.

New short teaser. Looks great!

Reviews are out. Overall the reviews are solid if not stellar. Metacriitc has a score of 80. No surprise there, first party Nintendo games always get good reviews it seems. But IGN has given it an absolutely brutal review and scored it a 5.
I don't think I've ever seen them pan a first-party, high-profile Nintendo game like that before.
and

Polygon wasn't quite as harsh, but the sentiment was similar in a lot of ways. The elements I see them being the most critical about are things that'd drive me nuts, so I'm thinking this might not be a game for me. (Also, I've never played a game in this series, so there's that.)